Ontology – An aside

Of the parts of animals some are simple: to wit, all such as divide
into parts uniform with themselves, as flesh into flesh; others are
composite, such as divide into parts not uniform with themselves,
as, for instance, the hand does not divide into hands nor the face
into faces.
And of such as these, some are called not parts merely, but limbs
or members. Such are those parts that, while entire in themselves,
have within themselves other diverse parts: as for instance, the head,
foot, hand, the arm as a whole, the chest; for these are all in themselves
entire parts, and there are other diverse parts belonging to them.